linux-kernel - Re: [RFC] [PATCH] cfq-iosched: add cfq group hierarchical scheduling support

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Message-ID: <4C7C4E42.9070109@cn.fujitsu.com>
Date:	Tue, 31 Aug 2010 08:35:14 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Chad Talbott <ctalbott@...gle.com>
CC:	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Jeff Moyer <jmoyer@...hat.com>,
	Divyesh Shah <dpshah@...gle.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Nauman Rafique <nauman@...gle.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH] cfq-iosched: add cfq group hierarchical scheduling
 support

Chad Talbott wrote:
> On Sun, Aug 29, 2010 at 11:50 PM, Gui Jianfeng
> <guijianfeng@...fujitsu.com> wrote:
>>  o Each cfq group has its own group service tree.
>>  o Each cfq group contains a "group schedule entity" (gse) that
>>    schedules on parent cfq group's service tree.
>>  o Each cfq group contains a "queue schedule entity"(qse), it
>>    represents all cfqqs located on this cfq group. It schedules
>>    on this group's service tree. For the time being, root group
>>    qse's weight is 1000, and subgroup qse's weight is 500.
>>  o All gses and qse which belones to a same cfq group schedules
>>    on the same group service tree.
> 
> Overall, I like this approach.  It's similar to what we are using with
> earlier hierarchical patches.  Can you improve the naming a little
> bit?  "qse" and "gse" look almost identical and breaks my brain.
> Maybe "queue_entity" and "group_entity"?  If entity is to much to
> type, then "item"?

Thanks for reviewing Chad.
I will modify the name.

Thanks,
Gui

> 
> Chad
> 
> 
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